Commentary for Shevuot 48:3

מידי דהוה אאיסור מוסיף

And Raba said further: According to the one who holds an inclusive prohibition [takes effect on a previous prohibition], if one says, 'I swear I shall not eat figs,' and then says, 'I swear I shall not eat figs and grapes,' because it takes effect on the grapes, it takes effect also on the figs. [But] this is self evident! - I might have thought that [in the case of] a prohibition which comes of its own accord we say it takes effect [on a previous prohibition], but [in the case of] a prohibition which is imposed by himself, we do not say this; therefore he teaches us [that even in this case it takes effect]. Raba the son of Rabbah raised an objection: [We learnt:] One may eat one portion [a ka-zayith] and yet be liable for it four sin offerings and one guilt offering, thus: An unclean person who ate heleb, which was nothar of holy food, on the Day of Atonement. R. Meir said: Also if it was Sabbath, and he carried it out in his mouth, he is liable. They [the Sages] said to him: It is not in the same category. Now, if it is [as you say], it is possible to have five; for example, if he said: I SWEAR I shall not eat dates and heleb,' because it takes effect on the dates, it takes effect also on the heleb?' - The Tanna mentions only [the case of] a prohibition which comes of its own accord, but a prohibition imposed by himself he does not mention. But [he mentions] holy food! - [It refers to] a firstborn, which is holy from the womb.

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